Decreased uncoordinated Pb2+ defects induced by Lewis base for high-quality PSCs with much improved carrier transportation
Perovskite solar cells (PSCs) have received extensive attention due to their excellent photovoltaic properties. However, existence of defects, such as Pb 2+ and I − vacancies, restricts its further improvement of power conversion efficiency (PCE) and affects the stability of PSCs devices. In this study, glycine methyl ester hydrochloride (GMEH) was introduced as interface modification material. As Lewis base, GMEH formed a chemical bonding of Pb–O with perovskite to decrease uncoordinated Pb 2+ defects, thus transfer of charge carriers was obviously facilitated, indicating that status of Pb 2+ in perovskite structure is one of key factors for carrier transportation. Meanwhile, amino group in GMEH combined with iodide to form hydrogen bond, thereby stabilized perovskite structure and decreased ion migration. Eventually, a champion efficiency of 21.94% was obtained with promoted short-circuit current ( J SC ) and fill factor (FF). Meanwhile, the stability of PSCs was significantly improved. The modified PSCs can maintain 90% of the initial efficiency after storing in a nitrogen filled glove box for 1700 h, while the control one can only maintain 55%. And the stability of the modified device in humid air was also greatly improved.
危险品化学品经营许可证（带存储）